aw

Proxmox VE 6.x release includes a feature to add custom cloud-init configs. Unfortunately there is poor documentation, so I had to figure this out by adding pieces of information together.

The custom cloud-init files (user-data, meta-data, network-config)

The cloud-init files need to be stored in a snippet. This is not very well documented:

1. Go to Storage View -> Storage -> Add -> Directory
2. Give it an ID such as snippets, and specify any path on your host such as /snippets
3. Under Content choose Snippets and de-select Disk image (optional)
4. Upload (scp/rsync/whatever) your user-data, meta-data, network-config files to your proxmox server in /snippets/snippets/ (the directory should be there if you followed steps 1-3)

aw

# HAProxy configuration - haproxy-db.cfg

##
## FRONTEND ##
##

# Load-balanced IPs for DB writes and reads
#
frontend db_write
	bind 172.16.0.50:3306

aw

#! /bin/sh
#
## Tested on Linux Debian 5.0 (Lenny)
#
# OK I know this is nothing new/special.
# If you've always configured your LBs a certain way, you might have to use this method instead.
#
# Scenario: High-availability setup with 2 HAProxy/Keepalived load-balancers on IPv6
#
# Problem: HAProxy won't start (cannot bind socket) because the virtual IPv6 address is not assigned

aw

I recently ran into an issue of MongoDB shell commands not working. The error message was:

Invariant failure !driverName.empty() && !driverVersion.empty() && !osType.empty() && !osName.empty() && !osArchitecture.empty() && !osVersion.empty() src/mongo/rpc/metadata/client_metadata.cpp

I ran an strace on the mongo command and saw it was trying (and failing) to open the following files:

aw

(patch _htHead
  '(case (lowc (till " ^M^J" T)) @S)
  (fill '(case (lowc (till " ^M^J" T))
            ("auth-hash:"   (setq *AUTH_HASH    (pack (cdr (line)))))
            ("auth-cookie:" (setq *AUTH_COOKIE  (pack (cdr (line)))))
            ("auth-token:"  (setq *AUTH_TOKEN   (pack (cdr (line)))))
            . @S) ) )

aw

#![no_std]
#![no_main]

use panic_halt as _;

use embedded_graphics::fonts::{Font12x16, Text};
use embedded_graphics::pixelcolor::Rgb565;
use embedded_graphics::prelude::*;
use embedded_graphics::primitives::Rectangle;
use embedded_graphics::{primitive_style, text_style};

aw

#!/bin/bash
#
# This script checks if a mysql server is healthy running on localhost. It will
# return:
#
# "HTTP/1.x 200 OK\r" (if mysql is running smoothly)
#
# - OR -
#
# "HTTP/1.x 500 Internal Server Error\r" (else)

aw

#!/usr/bin/env pil
# 64-bit max
#
# functions to set/clear/toggle a specific bit in an 64-bit integer (8 bytes)

[de lpad (Int)
  (pad 64 (bin Int) ]

[de getbit (Int Pos)
  (& 1 (>> Pos Int) ]

aw

This obtains the twos complement of a signed integer (from signed -> unsigned), or reverse (from unsigned -> signed)

• Int: an positive or negative integer
• Size: expressed in bits (ex: 8, 16, 32, 64...)

(de twos-complement (Int Size)
  (if (lt0 Int)
      (+ Int (>> (- Size) 1))
      (if (=0 (& Int (>> (- (- Size 1)) 1)))
 Int

aw

Problem

When parsing with PicoLisp (native) and the mq_getattr() call, I kept seeing errors such as:

corrupted size vs. prev_size

or